kmemleak: Introduce a default off mode for kmemleak

Introduce a new DEBUG_KMEMLEAK_DEFAULT_OFF config parameter that allows
kmemleak to be disabled by default, but enabled on the command line
via: kmemleak=on. Although a reboot is required to turn it on, its still
useful to not require a re-compile.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e722e9d62221..95ab402db9c0 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -400,6 +400,13 @@ config DEBUG_KMEMLEAK_TEST
 
           If unsure, say N.
 
+config DEBUG_KMEMLEAK_DEFAULT_OFF
+        bool "Default kmemleak to off"
+        depends on DEBUG_KMEMLEAK
+        help
+          Say Y here to disable kmemleak by default. It can then be enabled
+          on the command line via kmemleak=on.
+
 config DEBUG_PREEMPT
         bool "Debug preemptible kernel"
         depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT